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Poster: Administrator, Curator, or StaffTyler Date: Jul 16, 2006 7:01am
Forum: etree Subject: .flac24 / 24 bit recordings & LMA mp3s / m3u streams

I don't know much about 24 bit recordings. I just record my own stuff in 44.1k/16 bit. But I know some tapers record in '24 bit' and these recordings capture more 'bits' of audio data, making the sound wave more 'rich' with data and therefore, sound 'better'.

I also had been told that Live Music Archive derived mp3's made from these .flac24 files were 'bad' or 'wrong' for somereason. I thought they had a highpitch sound to them, or just sounded like static. something about the alt-preset standard that the LMA machines crank out made derivatives of flac24 files 'bad' and shouldn't be happening.

In fact, when you are importing a show, if you choose the file-type of the flac files to be "24-bit flac" instead of just "Flac" I think the system automatically creates the [CAT Lossy] rules.conf file that makes the LMA machines NOT create mp3's / streams from your recording.

But over the past month or so I've seen recordings like this one:

http://www.archive.org/details/dnove2006-06-29.matrix.flac24

that are 24 bit, but because the uploader made the metadata of the seed files 'flac' rather then '24-bit flac' .. the mp3's were created.

So my question is: is this a 'bad' thing? the stream sounded okay, with no problems... is my perception of mp3 derivatives created from 24-bit sources wrong? regardless, for shows like this, the metadata should be changed to 24-bit flac, so that it is picked up in searches like the link on the front page:

Search for Some 24-bit FLAC Recordings

Thanks for any insight you can help teach me about 24-bit flac and mp3's!

tyler

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Poster: Allen Gaitor Date: Jul 17, 2006 6:50am
Forum: etree Subject: Re: .flac24 / 24 bit recordings & LMA mp3s / m3u streams

I hope this is not too off topic. I have downloaded a couple of 24 bit recirdings, and the sound is quite good. Of course, they are very large files so they occupy a lot of space on a hard drive. I would like find a way to burn them to DVD, perhaps as DVD Audio or some other format that will allow playback. If anyone has a software package they would recommend, along with any other guidance on the subject, I would appreciate the pointers.

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Poster: JasonSobel Date: Jul 17, 2006 11:38am
Forum: etree Subject: Re: .flac24 / 24 bit recordings & LMA mp3s / m3u streams

http://24bit.turtleside.com/

that website lists just about all the options for burning DVD discs of 24 bit material...

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Poster: Allen Gaitor Date: Jul 18, 2006 6:50am
Forum: etree Subject: Re: .flac24 / 24 bit recordings & LMA mp3s / m3u streams

Thanks Jason. I have monkeyed around with a software package called Apollo DVD Audio Creator (I think), but have not gotten it to work. I will try the freeware shown on the link you provided. The sound quality on some of the 24-Bit recordings on the archive is pretty amazing. It would be nice to be able to preserve it on a DVD.

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Poster: easy jim Date: Jul 16, 2006 10:44am
Forum: etree Subject: Re: .flac24 / 24 bit recordings & LMA mp3s / m3u streams

Thanks for the heads up. I had no idea that "24bit Flac" was even there as an option.

I've fixed that now and selected "24bit FLAC" as the file type. I had actually made a mistake there, and had not intended to allow derivates for the 24 bit version, so the derivates are now only available for the 16 bit source.

I remembered reading somewhere that there are not really any mp3 encoders that did a good job with 24 bit source files that had not been pre-dithered/resampled, so my intention had been to have the derivates go along only with the 16 bit file sets.

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Poster: ShawnF Date: Jul 16, 2006 11:33am
Forum: etree Subject: Re: .flac24 / 24 bit recordings & LMA mp3s / m3u streams

Ditto on not knowing that was even an option--maybe it should be mentioned in the .pdf and text file descriptions of "How do I upload a show to the LMA?" :
http://www.archive.org/about/faq.php?faq_id=119

I've wondered about the derivatives for 24-bit shows, too. If it's decided that we shouldn't allow them, perhaps the option to create them shouldn't be listed as "recommended" for 24-bit FLAC fileset2 (if that's possible).

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Poster: Administrator, Curator, or StaffBrad Leblanc Date: Jul 17, 2006 11:31am
Forum: etree Subject: Re: .flac24 / 24 bit recordings & LMA mp3s / m3u streams

I've wondered about the derivatives for 24-bit shows, too. If it's decided that we shouldn't allow them, perhaps the option to create them shouldn't be listed as "recommended" for 24-bit FLAC filesets (if that's possible).

But that option *is* still recommended. I think your confusion is that you associate "derivatives" strictly with MP3's and Ogg's, when in fact it could be a number of other formats depending on the source files. -- If you upload a scanned book, we don't create MP3's yet we still recommend them because the system has been designed to respond to you telling us what format file is being provided. In this case you input "24bit FLAC" from the dropdown, and the system does not have any possible derivatives (yet).

However, we may add something in the future if we find it complements FLAC's, and we'd like you to allow this on your uploads.

As always, your choice though.

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Poster: Administrator, Curator, or StaffBrad Leblanc Date: Jul 17, 2006 11:28am
Forum: etree Subject: Re: .flac24 / 24 bit recordings & LMA mp3s / m3u streams

In fact, when you are importing a show, if you choose the file-type of the flac files to be "24-bit flac" instead of just "Flac" I think the system automatically creates the [CAT Lossy] rules.conf file that makes the LMA machines NOT create mp3's / streams from your recording.

Clarification - the deriver just knows that MP3's and Ogg's derived from 24bit audio should not be done so it skips those 2 possible derivative formats. It does not tell the system to auto-set rules.conf with that info - since we may introduce derivatives that are not MP3's or Ogg's and are friendly to 24bit audio sometime in the future.